diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..814b55a
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,5 @@
+repos:
+  - repo: https://github.com/kamadorueda/alejandra
+    rev: 3e2a85506627062313e131bf8a85315f3387c8e0  # frozen: 4.0.0
+    hooks:
+      - id: alejandra-system